Peugeot 405 Manual

Cylinder head - dismantling
Engine removal and overhaul procedures / Cylinder head - dismantling


Note: New and reconditioned cylinder heads are available from the manufacturer, and from engine overhaul specialists. Be aware that some specialist tools are required for the dismantling and inspection procedures, and new components may not be readily available.

It may therefore be more practical and economical for the home mechanic to purchase a reconditioned head, rather than dismantle, inspect and recondition the original head.

1 Remove the cylinder head as described in Part A or B of this Chapter (as applicable).

2 If not already done, remove the inlet and exhaust manifolds with reference to the relevant Part of Chapter 4.

3 Remove the camshaft(s), followers and shims (as applicable) as described in Part A or B of this Chapter.

4 Using a valve spring compressor, compress each valve spring in turn until the split collets can be removed. Release the compressor, and lift off the spring retainer, spring and spring seat. Using a pair of pliers, carefully extract the valve stem seal from the top of the guide (see illustrations).

7.4a Compress the valve spring using a spring compressor . . .
7.4a Compress the valve spring using a spring compressor . . .

7.4b . . . then extract the collets and release the spring compressor
7.4b . . . then extract the collets and release the spring compressor

7.4c Remove the spring retainer . . .
7.4c Remove the spring retainer . . .

7.4d . . . followed by the valve spring . . .
7.4d . . . followed by the valve spring . . .

7.4e . . . and the spring seat
7.4e . . . and the spring seat

7.4f Remove the valve stem oil seal using a pair of pliers
7.4f Remove the valve stem oil seal using a pair of pliers

5 If, when the valve spring compressor is screwed down, the spring retainer refuses to free and expose the split collets, gently tap the top of the tool, directly over the retainer, with a light hammer. This will free the retainer.

6 Withdraw the valve through the combustion chamber.

7 It is essential that each valve is stored together with its collets, retainer, spring, and spring seat. The valves should also be kept in their correct sequence, unless they are so badly worn that they are to be renewed. If they are going to be kept and used again, place each valve assembly in a labelled polythene bag or similar small container (see illustration).

7.7 Place each valve and its associated components in a labelled polythene
7.7 Place each valve and its associated components in a labelled polythene bag

Note that No 1 valve is nearest to the transmission (flywheel/driveplate) end of the engine.

8 On XU engines extract the gauze oil filter from the oil gallery in the cylinder head (see illustration).

7.8 Oil filter partly withdrawn from the oil gallery in the cylinder head
7.8 Oil filter partly withdrawn from the oil gallery in the cylinder head


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